| Autor: |
Siwen Zhang, Delian Ye, Weiqi Wang, Da Su, Xiaojun Yan, Xiuzhu Xu, Xuefan Weng, Fusuo Zhang, Shungui Zhou, Mingkuang Wang, Liangquan Wu, Xiaohui Chen, Yong Hou, Jiuxin Guo, Yuanyang Cai, Donghui Liu, Ling Tong |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Soil and Tillage Research. 215:105214 |
| ISSN: |
0167-1987 |
| Popis: |
The effects of long-term excessive phosphorus (P) fertilization on the P fraction changes and P loss risk in orchard soils remain unclear. This study aimed to assess the concentrations of and relationships among the soil total P (TP), Olsen-P and P fractions in pomelo orchard (PO) soil during different fertilization periods. The PO soils were in a severe P overapplication state (905.4 kg P2O5 ha-1 yr-1), with a high P surplus (773.5 kg P2O5 ha-1 yr-1) and low P use efficiency (PUE, 14.7%). Such long-term excessive fertilizer P input significantly increased the TP, Olsen-P, and P fraction concentrations and significantly reduced the proportions of Org-P and reduction-P (Red-P) in both the surface (0–20 cm) and subsurface (20–40 cm) soils but increased the proportions of easily soluble P (Sol-P), aluminum-P (Al–P) and iron-P (Fe–P) rather than calcium-P (Ca–P). Furthermore, the P fractions exhibited a corresponding increasing trend and a significant linear (or two-stage linear) relationship with the soil P surplus. There is a serious risk of P loss when the P surplus in the surface soil exceeds 4128 kg P ha-1. Al–P had the highest correlation with Olsen-P (R = 0.984, p |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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